Abstract: Single-supply inverter based on floating capacitor power supply only needs a single independent voltage source,which has better applicability in specific occasions. However,the floating capacitor voltage in the topology cannot be controlled with traditional modulation strategy,which seriously affects the output performance of the inverter. In order to solve the above problem,a new regulation strategy based on working mode switching was proposed. The detailed theoretical analysis and calculation of modulation principle of two working modes,principle of voltage regulation control and regulator control characteristics were carried out. The proposed regulation strategy can achieve different charging and discharging effects on the floating capacitor by selecting different working modes. Therefore,fast and stable regulation of the floating capacitor voltage can be achieved. Finally,the correctness and feasibility of the proposed new regulation strategy were verified by simulation and experiment.